That means the first 14 pages are front matter and the next 313 are content. If this metadata is embedded in a PDF, then a Kindle knows that "go to page 31" means "go to page 31 of the arabic-numeral pages". If this is not part of the PDF, it treats page 31 as "31 pages from the beginning of the PDF", which is not as useful.

So, the question is:
- can the page number metadata be retrieved by a plugin?
- can the metadata be embedded in a PDF by a plugin?

One catch is that a PDF may not contain the same number of pages as is listed in a bibliographic database (e.g., it may also contain an embedded cover as an extra page).